What CFM would i need if i wanted to replace my mechanical fan with an electric fan? Also my truck doesn't have a fan shroud, should i replace then when i put in the puller fan?

 

you should always have a shroud. The flow rates advertised always assume the appropriate shroud is in place.

 

ok, what CFM should i buy?

 

Maximum

 

You're better off putting in a shroud and using a fan clutch, if you have room for it. A shroud makes a big difference with mechanical fans.

 

I HAD a tausus fan on my truck untill last weekend when the controller that I had took a crap. It worked for me in the month that I had it on. I've read that it puts out something like 4000cfm.

 

Well, i'm taking out the clutch fan, and i'd like to buy only one fan, so a should and 2000 - 4000cfm fan?

 

The only reason to run an electric is if you run in deep water or drag race. Otherwise the mechanical clutch fan with shroud can't be beat for efficiency and reliability. I you have to have an electric for bling value get the highest CFM unit you can fit in and hope it is enuf. Have it wired to professional standards by an experienced mechanic.

 

Get a fan shroud. They are cheaper than a big cfm flow fan and the difference between shroud and no shroud is like night and day. I was going to go the same route you did, but it was cheaper to buy a shroud that an electric fan, and my truck runs cool as can be now. Just my advice from my experience.

 

got a 16 inch electric fan from auto zone, works great. for the fan and the kit that auto maticaly kicks it on at the correct tempature it was about 100 dollars

 

A good thing to know here would be the cfm's of the stock fan. Does anyone know this number?

 

I dissagree, replacing the clutch fan takes mechanical drag off the engine, freeing up not only the engine, but horsepower too.

 

How much HP can one get out of an engine that gets cooked if the fan fails ?

The HP loss amount is insignificant.

Now if that was a Viscious Fan vs Electric.

That's more loss.

I don't trust a lot of electric devices and I hate paying towing charges.

 

That's a huge what if, how many cars are on the road now with ONLY electric fans?

 

The electric fan pulls HP also thru the terrible inefficiencies of the electrical system. The alternator turns mechanical rotational energy into electrical power with at best 45% efficiency. Then that power is passed thru wires and connections that lose more energy thru heat called ohmic losses. Then the fan is turned by a small electric motor that will see around 75-80% efficiency at best. The OEM's presently use a mechanical fan every place they can and they are looking for CAFE and HP.

Future vehicles will be all electric but they will employ more efficient high voltage electrical systems and very sophisticated controls. -Of course that will mean more $$$$ things to go wrong...

The OEM electric fans, mounting, and wiring are much better than the aftermarket mickey mouse stuff. Much more reliable.

I have never seen any CFM figures for the stock fan. The CFM's would vary with temperature and RPM due to the action of the thermostatic clutch.